Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/15484#discussion_r86688702
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -229,10 +235,14 @@ class Analyzer(
* Group Count: 2 ^ N (N is the number of group expressions)
*
* We need to get all of its subsets for a given GROUPBY expression,
the subsets are
- * represented as the bit masks.
+ * represented as sequence of expressions.
*/
- def bitmasks(c: Cube): Seq[Int] = {
- Seq.tabulate(1 << c.groupByExprs.length)(i => i)
+ def cubeExprs(exprs: Seq[Expression]): Seq[Seq[Expression]] =
exprs.toList match {
--- End diff --
I'm afraid we can't just map the `exprs` to a set because we want to keep
the original order.
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